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term.c revision 1.6 
      1 /*	$NetBSD: term.c,v 1.6 1994/12/07 05:08:12 jtc Exp $	*/
      2 
      3 /*-
      4  * Copyright (c) 1991, 1993
      5  *	The Regents of the University of California.  All rights reserved.
      6  *
      7  * Redistribution and use in source and binary forms, with or without
      8  * modification, are permitted provided that the following conditions
      9  * are met:
     10  * 1. Redistributions of source code must retain the above copyright
     11  *    notice, this list of conditions and the following disclaimer.
     12  * 2. Redistributions in binary form must reproduce the above copyright
     13  *    notice, this list of conditions and the following disclaimer in the
     14  *    documentation and/or other materials provided with the distribution.
     15  * 3. All advertising materials mentioning features or use of this software
     16  *    must display the following acknowledgement:
     17  *	This product includes software developed by the University of
     18  *	California, Berkeley and its contributors.
     19  * 4. Neither the name of the University nor the names of its contributors
     20  *    may be used to endorse or promote products derived from this software
     21  *    without specific prior written permission.
     22  *
     23  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
     24  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
     25  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
     26  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
     27  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
     28  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
     29  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
     30  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
     31  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
     32  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
     33  * SUCH DAMAGE.
     34  */
     35 
     36 #ifndef lint
     37 #if 0
     38 static char sccsid[] = "@(#)term.c	8.1 (Berkeley) 6/9/93";
     39 #endif
     40 static char rcsid[] = "$NetBSD: term.c,v 1.6 1994/12/07 05:08:12 jtc Exp $";
     41 #endif /* not lint */
     42 
     43 #include <sys/types.h>
     44 #include <errno.h>
     45 #include <ttyent.h>
     46 #include <unistd.h>
     47 #include <stdio.h>
     48 #include <stdlib.h>
     49 #include <string.h>
     50 #include "extern.h"
     51 
     52 char    tbuf[1024];      		/* Termcap entry. */
     53 
     54 char	*askuser __P((char *));
     55 char	*ttys __P((char *));
     56 
     57 /*
     58  * Figure out what kind of terminal we're dealing with, and then read in
     59  * its termcap entry.
     60  */
     61 char *
     62 get_termcap_entry(userarg, tcapbufp)
     63 	char *userarg, **tcapbufp;
     64 {
     65 	struct ttyent *t;
     66 	int rval;
     67 	char *p, *ttype, *ttypath;
     68 
     69 	if (userarg) {
     70 		ttype = userarg;
     71 		goto found;
     72 	}
     73 
     74 	/* Try the environment. */
     75 	if (ttype = getenv("TERM"))
     76 		goto map;
     77 
     78 	/* Try ttyname(3); check for dialup or other mapping. */
     79 	if (ttypath = ttyname(STDERR_FILENO)) {
     80 		if (p = rindex(ttypath, '/'))
     81 			++p;
     82 		else
     83 			p = ttypath;
     84 		if ((t = getttynam(p))) {
     85 			ttype = t->ty_type;
     86 			goto map;
     87 		}
     88 	}
     89 
     90 	/* If still undefined, use "unknown". */
     91 	ttype = "unknown";
     92 
     93 map:	ttype = mapped(ttype);
     94 
     95 	/*
     96 	 * If not a path, remove TERMCAP from the environment so we get a
     97 	 * real entry from /etc/termcap.  This prevents us from being fooled
     98 	 * by out of date stuff in the environment.
     99 	 */
    100 found:	if ((p = getenv("TERMCAP")) != NULL && *p != '/')
    101 		unsetenv("TERMCAP");
    102 
    103 	/*
    104 	 * ttype now contains a pointer to the type of the terminal.
    105 	 * If the first character is '?', ask the user.
    106 	 */
    107 	if (ttype[0] == '?')
    108 		if (ttype[1] != '\0')
    109 			ttype = askuser(ttype + 1);
    110 		else
    111 			ttype = askuser(NULL);
    112 
    113 	/* Find the termcap entry.  If it doesn't exist, ask the user. */
    114 	while ((rval = tgetent(tbuf, ttype)) == 0) {
    115 		(void)fprintf(stderr,
    116 		    "tset: terminal type %s is unknown\n", ttype);
    117 		ttype = askuser(NULL);
    118 	}
    119 	if (rval == -1)
    120 		err("termcap: %s", strerror(errno ? errno : ENOENT));
    121 	*tcapbufp = tbuf;
    122 	return (ttype);
    123 }
    124 
    125 /* Prompt the user for a terminal type. */
    126 char *
    127 askuser(dflt)
    128 	char *dflt;
    129 {
    130 	static char answer[256];
    131 	char *p;
    132 
    133 	/* We can get recalled; if so, don't continue uselessly. */
    134 	if (feof(stdin) || ferror(stdin)) {
    135 		(void)fprintf(stderr, "\n");
    136 		exit(1);
    137 	}
    138 	for (;;) {
    139 		if (dflt)
    140 			(void)fprintf(stderr, "Terminal type? [%s] ", dflt);
    141 		else
    142 			(void)fprintf(stderr, "Terminal type? ");
    143 		(void)fflush(stderr);
    144 
    145 		if (fgets(answer, sizeof(answer), stdin) == NULL) {
    146 			if (dflt == NULL) {
    147 				(void)fprintf(stderr, "\n");
    148 				exit(1);
    149 			}
    150 			return (dflt);
    151 		}
    152 
    153 		if (p = index(answer, '\n'))
    154 			*p = '\0';
    155 		if (answer[0])
    156 			return (answer);
    157 		if (dflt != NULL)
    158 			return (dflt);
    159 	}
    160 }
    161